CN218960082U

CN218960082U - Atomizing piece oscillation control circuit and electronic atomizing terminal

Info

Publication number: CN218960082U
Application number: CN202223153326.7U
Authority: CN
Inventors: 姜新桥; 孙荣孟; 邓文拔
Original assignee: Shenzhen Smart Core Technology Co ltd
Current assignee: Shenzhen Smart Core Technology Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-05-05
Anticipated expiration: 2032-11-28

Abstract

The application discloses an atomizing piece oscillation control circuit and an electronic atomizing terminal, wherein the atomizing piece oscillation control circuit comprises a microcontroller, a driving signal generating circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply component; the power supply component is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switching circuit, and is also connected with the other end of the atomizing sheet through the boosting oscillating circuit, and the duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit. The signal output end of the driving signal generating circuit is connected with the trigger input end of the driving signal regulating circuit, and the regulating output end of the driving signal regulating circuit is connected with the control end of the switching circuit; one end of the atomizing sheet is connected with the output end of the switch circuit, and the other end of the atomizing sheet is connected with the output end of the boosting oscillation circuit, so that the atomizing sheet generates periodic amplitude.

Description

Atomizing piece oscillation control circuit and electronic atomizing terminal

Technical Field

The utility model relates to the technical field of ultrasonic electronic cigarettes, in particular to an atomization sheet oscillation control circuit and an electronic atomization terminal.

Background

The existing ultrasonic electronic cigarette atomizing sheet driving circuit can acquire excitation signals by using a universal capacitor three-point type oscillating circuit and an inductance three-point type oscillating circuit to drive the ultrasonic atomizing sheet to oscillate, and the ultrasonic electronic cigarette atomizing sheet driving circuit is controlled to work by means of a single transistor.

In order to improve the driving current and voltage and meet the requirement of atomization sheet resonance work, a plurality of transistors, resistors, capacitors and other discrete devices are distributed in a limited electronic cigarette accommodating space, a detection network and a multi-order RC filter network are additionally arranged, so that the layout difficulty of the discrete devices is increased, heat is easily accumulated, and the miniaturization of the ultrasonic electronic cigarette is difficult to realize.

Disclosure of Invention

The application discloses atomizing piece oscillation control circuit and electron atomizing terminal, including following technical scheme:

an atomization sheet oscillation control circuit comprises a microcontroller, a driving signal generating circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply component; the power supply component is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switching circuit, and is also connected with the other end of the atomizing sheet through the boosting oscillating circuit, and the duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit.

Further, a signal output end of the driving signal generating circuit is connected with a trigger input end of the driving signal adjusting circuit, and an adjusting output end of the driving signal adjusting circuit is connected with a control end of the switching circuit; one end of the atomizing sheet is connected with the output end of the switch circuit, and the other end of the atomizing sheet is connected with the output end of the boosting oscillation circuit.

Further, the driving signal generating circuit comprises a first resistor, a second resistor, an inverter, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first PMOS tube, a first NMOS tube and a second NMOS tube; the first input end of the inverter is a signal input end of the driving signal generating circuit, and is connected with the PWM signal output by the microcontroller; the first resistor is connected between the first input end of the inverter and the second input end of the inverter, and the first input end of the inverter is connected with the positive power end of the inverter through the second resistor; the positive power end of the inverter is connected with one end of a third resistor, the other end of the third resistor is connected between the first capacitor and the fourth resistor, and the other end of the third resistor is also connected with the power supply component; the power supply component is grounded through a first capacitor, and the drain electrode of the first NMOS tube is connected with the power supply component through a fourth resistor; the source electrode of the first PMOS tube is connected with the source electrode of the first NMOS tube, the grid electrode of the first PMOS tube is connected with the grid electrode of the first NMOS tube, the grid electrode of the first NMOS tube is connected with the output end of the phase inverter, the drain electrode of the first PMOS tube is grounded, the drain electrode of the second NMOS tube is connected between the source electrode of the first PMOS tube and the source electrode of the first NMOS tube, the driving signal generating circuit is connected to the driving signal regulating circuit through the second NMOS tube, and the signal output end of the driving signal generating circuit is the source electrode of the second NMOS tube.

Further, the driving signal adjusting circuit comprises a monostable trigger chip, a second capacitor and a fifth resistor; the upper edge trigger input end of the monostable trigger chip is connected with the source electrode of the second NMOS tube, and the lower edge trigger input end of the monostable trigger chip and the grounding end of the monostable trigger chip are grounded; the zero clearing end of the monostable trigger chip and the power supply end of the monostable trigger chip are connected with the power supply assembly; one end of a fifth resistor is connected with the power supply component, the other end of the fifth resistor is connected with one end of a second capacitor, the other end of the second capacitor is grounded, the fifth resistor is connected between the power supply end of the monostable trigger chip and the resistor external end of the monostable trigger chip, and the second capacitor is connected between the resistor external end of the monostable trigger chip and the capacitor external end of the monostable trigger chip; the trigger input end of the drive signal regulating circuit is the upper edge trigger input end of a monostable trigger chip, and the output end of the monostable trigger chip is the regulating output end of the drive signal regulating circuit; the time constant of the fifth resistor and the second capacitor determines a timing period required by the output end of the monostable trigger chip to generate a level signal with preset pulse width; the frequency of the signal input by the trigger input end of the driving signal adjusting circuit is the same as the frequency of the signal output by the adjusting output end of the driving signal adjusting circuit.

Further, the driving signal adjusting circuit further comprises a sixth resistor and a switch; one end of the sixth resistor is connected with the grid electrode of the second NMOS tube, and the other end of the sixth resistor is connected with the power supply component; one end of the switch is connected with the grid electrode of the second NMOS tube and the duty ratio enabling end of the microcontroller at the same time, and the other end of the switch is grounded.

Further, the switching circuit comprises a seventh resistor and a third NMOS tube, the grid electrode of the third NMOS tube is connected with one end of the seventh resistor, the source electrode of the third NMOS tube is connected with the other end of the seventh resistor, the other end of the seventh resistor is grounded, the drain electrode of the third NMOS tube is the output end of the switching circuit to be connected with the atomizing sheet, and the control end of the switching circuit is the grid electrode of the third NMOS tube to be connected with the driving signal regulating circuit.

Further, the boost oscillating circuit comprises a linear boost unit, an inductor, a third capacitor, a fourth capacitor and an eighth resistor; the input end of the linear boosting unit is connected with the power supply component, the output end of the linear boosting unit is connected with one end of the inductor, the other end of the inductor is connected with one end of the third capacitor, the other end of the third capacitor is connected with one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; one end of the eighth resistor is connected between the inductor and the third capacitor, and the other end of the eighth resistor is connected with the output end of the switching circuit; the output end of the boost oscillating circuit is arranged at a common endpoint of the third capacitor and the fourth capacitor; the linear boosting unit is a direct current boosting chip or a resistance-capacitance boosting circuit connected with the direct current boosting chip.

Further, the microcontroller is used for supporting the modulation of an alternating current signal or a direct current signal into a PWM signal and outputting the PWM signal by a duty ratio output end; the power supply component is used for providing direct current signals or alternating current signals for the driving signal generating circuit, the boosting oscillating circuit and the driving signal regulating circuit respectively.

Further, the atomizing sheet includes, but is not limited to, a piezoelectric ceramic sheet; the atomization sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize liquid on the surface of the atomization sheet; the certain frequency is generated after the voltage is applied to the atomizing sheet by the boosting oscillating circuit and the switching circuit.

An electronic atomizing terminal comprises the atomizing sheet oscillation control circuit.

In the atomizing sheet oscillation control circuit disclosed by the application, a driving signal generating circuit is used for shaping PWM signals provided by a microcontroller into stable square wave signals and providing large enough driving voltage and current for a boosting oscillation circuit and a driving signal regulating circuit, the driving signal regulating circuit is triggered to quicken responding to high-level signals or low-level signals output by the driving signal generating circuit and trigger the driving signal regulating circuit to generate positive and negative pulse signals with a certain time width, namely, single output pulse with a specified width is generated, namely 'high' or 'low', so that not only MOS tubes in the switching circuit are conducted to the ground to be discharged rapidly, but also the driving signal regulating circuit is used for controlling the switching circuit to be turned on and off periodically. Therefore, the temperature rise of the discrete component or the chip module is limited by timing control of the on time of the switch circuit, and the influence of the temperature on the operation of the atomizing sheet is suppressed.

A linear boosting unit is arranged in the boosting oscillation circuit, a voltage division network formed by discrete resistance elements and a filter network formed by discrete resistance elements and discrete capacitance elements are reduced, and a necessary inductance-capacitance network is designed to drive the atomizing sheet to oscillate at high frequency.

The driving signal adjusting circuit is internally provided with a monostable trigger chip, under the triggering action of externally applied duty ratio signals, high-level signals and low-level signals with certain time width can be output in turn according to a time constant determined by a resistance-capacitance network formed by a single capacitor and a single resistor, and the high-level signals and the low-level signals are carried out in a timing period determined by the time constant, so that the atomizing chip can carry out oscillation work and stop oscillation work in a controllable time (the pulse width determined by the resistance-capacitance externally connected with the monostable trigger chip), the oscillation signals generated by the boosting oscillation circuit and used for driving the atomizing chip are periodically adjusted in a monostable trigger mode, and continuous temperature rise of related MOS tubes is restrained on the basis of using the chip module to build the driving signal adjusting circuit as much as possible, for example, continuous temperature rise is not needed in a complete temperature rise period.

Compared with the prior art, the totem circuit formed by the inverter and the pair of MOS tubes is arranged in the driving signal generation circuit, the method has the advantages that a small number of discrete devices are matched with a single circuit module to obtain a pulse signal with larger and more stable driving voltage, and then under the combined action of the driving signal adjusting circuit and the boosting oscillation circuit, the atomization sheet is accelerated to reach a resonance state in a certain time period.

In sum, this application uses at most one resistance-capacitance network and at most one chip module to control the vibration work of atomizing piece in every circuit, is difficult to gather the heat, overcomes the influence that MOS pipe temperature is too high, also realizes the miniaturization of the electron atomizing terminal that is equipped with atomizing piece oscillation control circuit in easily.

Drawings

Fig. 1 is a schematic structural diagram of an oscillation control circuit for an atomization plate according to an embodiment.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As an embodiment, disclosed is an oscillation control circuit for an atomization sheet, referring to fig. 1, the oscillation control circuit for an atomization sheet disclosed in the embodiment includes a microcontroller, a driving signal generating circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply component; the power supply component is connected with one end of the atomizing sheet through the driving signal generating circuit, the driving signal adjusting circuit and the switching circuit in sequence, and is also connected with the other end of the atomizing sheet through the boosting oscillation circuit, namely the driving signal generating circuit, the driving signal adjusting circuit, the switching circuit and the boosting oscillation circuit are connected between the microcontroller and the atomizing sheet or between the power supply component and the atomizing sheet; the drive signal generating circuit, the drive signal adjusting circuit and the switch circuit are connected in series, and the boosting oscillation circuit and the atomizing sheet are connected in series; it can be understood that the boost oscillation circuit is connected in series with the atomizing plate first, and then sequentially connected in series with the switch circuit, the driving signal adjusting circuit and the driving signal generating circuit.

In this embodiment, the oscillation working circuit of the atomizing sheet may be a closed circuit formed by sequentially passing through the driving signal generating circuit, the driving signal adjusting circuit, the switching circuit, the positive electrode of the atomizing sheet, the negative electrode of the atomizing sheet, and the boost oscillating circuit from the positive electrode of the power supply assembly, and finally returning to the negative electrode of the power supply assembly. Furthermore, in the present embodiment, both the atomizing plate oscillation control circuit and the atomizing plate are mounted in the housing of the electronic atomizing terminal, and the atomizing plate oscillation control circuit is preferably mounted on the drive circuit board inside the housing of the electronic cigarette.

The duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit, the duty ratio output end of the microcontroller is the signal output end of the microcontroller, the driving signal generating circuit shapes PWM signals under the control of PWM signals output by the duty ratio output end of the microcontroller, pulse width is adjusted by the driving signal adjusting circuit after shaping the PWM signals, on-off of the switching circuit is controlled stably, and whether the atomizing sheet oscillation control circuit controls the atomizing sheet to perform oscillation action and accelerate oscillation starting connection can be understood.

The microcontroller comprises a single chip microcomputer, a microprocessor or a DSP, and is configured to at least support the modulation of an alternating current signal or a direct current signal into a PWM signal and output the PWM signal by a duty ratio output end, wherein the signal to be modulated can be a low-frequency signal, and the modulation forms a high-frequency signal output so as to receive the adjustment of the driving signal generating circuit and the driving signal adjusting circuit. The power supply component is used for providing direct current signals or alternating current signals for the driving signal generating circuit, the boosting oscillating circuit and the driving signal regulating circuit respectively. The power supply voltage provided by the power supply assembly is typically 1.8V, 3.3V or 5V.

In this embodiment, the driving signal adjusting circuit is configured to perform shaping processing on the duty ratio signal output by the driving signal generating circuit, and includes amplifying processing, inverting processing, and the like on the PWM signal output by the microcontroller to improve the driving capability (including the driving current and the driving voltage) of the PWM signal, so as to obtain a stable square wave signal; in order to facilitate control, the signal output end of the driving signal generating circuit is connected with the trigger input end of the driving signal adjusting circuit, so that the trigger input end of the driving signal adjusting circuit receives a more stable square wave signal, and the driving signal adjusting circuit is used for adjusting the pulse width of the duty ratio signal output by the driving signal generating circuit, including the pulse width of a high-level signal or a low-level signal, so that the pulse width is adjusted in a more stable and effective level state; the control end of the driving signal adjusting circuit is connected with the control end of the switching circuit, the switching circuit is conducted under a high-level signal output by the adjusting output end of the driving signal adjusting circuit, and the switching circuit is closed under a low-level signal output by the adjusting output end of the driving signal adjusting circuit, wherein the high-level signal and the low-level signal output by the adjusting output end of the driving signal adjusting circuit are alternately generated during an electronic atomizing terminal where an aspirator uses the atomizing sheet oscillation control circuit; one end of the atomizing sheet is connected with the output end of the switch circuit, the other end of the atomizing sheet is connected with the output end of the boost oscillation circuit, so that the atomizing sheet generates periodic amplitude, the MOS tube is heated in one time period and then is cut off in an adjacent time period to cool and dissipate heat, and the atomizing sheet can be kept at a fixed working frequency to oscillate in the conduction stage of the switch circuit, so that the atomizing sheet is easy to be stabilized in a resonant working state.

In this embodiment, the boost oscillation circuit is provided with a linear boost unit, a voltage division network formed by discrete resistive elements and a filter network formed by discrete resistive elements and discrete capacitive elements are reduced, and a necessary inductance-capacitance network is designed to drive the atomizing sheet to oscillate at high frequency.

The atomizing sheet includes, but is not limited to, a piezoelectric ceramic sheet; the atomization sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize liquid on the surface of the atomization sheet; wherein, a certain frequency is generated after the voltage is applied to the atomizing sheet by the boost oscillating circuit and the switch circuit; when a certain frequency is located at a resonance frequency (resonance frequency), the atomization efficiency of the atomization sheet is highest, and after the atomization sheet is in a resonance state, the influence of temperature on the working efficiency of the atomization sheet is overcome to a certain extent. Specifically, the atomizing sheet may be provided with a piezoelectric element substrate having a comb-shaped electrode pair; when a liquid supply unit provided in the electronic atomizing terminal supplies liquid to be atomized to the piezoelectric element substrate, the piezoelectric element substrate is configured to atomize the liquid by using a surface elastic wave generated by applying a voltage to the comb-shaped electrode pair at a high frequency (resonance frequency or resonance frequency can be reached). The boost oscillation circuit can supply power required by oscillation of the comb-shaped electrode pair, and comprises voltage and frequency required by oscillation of the driving atomizing sheet, and meanwhile, the driving signal generation circuit, the driving signal adjusting circuit and the switching circuit are used as electric signal on-off and time adjusting circuits for driving the atomizing sheet to oscillate and are used for improving atomizing efficiency of the atomizing sheet.

In some embodiments, the boost oscillating circuit and the driving signal adjusting circuit may generate a high frequency signal, including a high frequency voltage, wherein the high frequency voltage has a periodic amplitude, and the periodic amplitude of the high frequency voltage may describe a sine wave shape, a rectangular wave shape, a triangular wave shape, a sawtooth wave shape, and preferably the high frequency voltage is applied in such a manner that the periodic amplitude of the high frequency voltage describes a rectangular wave shape. The step-up oscillation circuit is configured to periodically control the frequency of the voltage applied to the comb-shaped electrode pair under the constraint of the pulse width regulated by the drive signal regulating circuit, and can control the oscillation frequency of the comb-shaped electrode pair at the resonance frequency; in some oscillating environments, the resonant frequency may change over time, subject to factors such as temperature. The control of the drive signal generation circuit, the drive signal adjustment circuit, and the switching circuit, including adjustment of the pulse width of the high-level signal and the pulse width of the low-level signal, can be performed by monitoring the output signal of the boost oscillation circuit and the frequency at which the time passes, and then supplying power at the monitored optimum frequency, whereby the atomizing efficiency of the atomizing sheet can be improved.

As an embodiment, referring to fig. 1, the driving signal generating circuit includes a first resistor R1, a second resistor R2, an inverter U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a first PMOS transistor MP1, a first NMOS transistor MN1, and a second NMOS transistor MN2; the first input end of the inverter U1 is a signal input end of the driving signal generating circuit, and the first input end of the inverter U1 is connected with the PWM signal output by the microcontroller; the first resistor R1 is connected between the first input end of the inverter U1 and the second input end of the inverter U1, and the first input end of the inverter U1 is connected with the positive power supply end of the inverter U1 through the second resistor R2; the positive power end of the inverter U1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected between a first capacitor C1 and a fourth resistor R4, one end of the first capacitor C1 is connected with one end of the fourth resistor R4, and the drain electrode of the first NMOS tube is connected with the other end of the fourth resistor R4; the other end of the third resistor R3 is further connected to the power supply assembly, that is, the other end of the third resistor R3 is connected to VCC (which may be regarded as the voltage provided by the positive power supply end of the power supply assembly), and the negative power supply end of the power supply assembly is grounded.

The power supply component is grounded through a first capacitor C1, and the drain electrode of the first NMOS tube MN1 is connected with the power supply component through a fourth resistor R4; the source of the first PMOS tube MP1 is connected with the source of the first NMOS tube MN1, the grid of the first PMOS tube MP1 is connected with the grid of the first NMOS tube MN1, the grid of the first NMOS tube MN1 is connected with the output end of the inverter U1, the drain of the first PMOS tube MP1 is grounded, the drain of the second NMOS tube MN2 is connected between the source of the first PMOS tube MP1 and the source of the first NMOS tube MN1, the driving signal generating circuit is connected to the driving signal regulating circuit through the second NMOS tube MN2, wherein the signal output end of the driving signal generating circuit is the source of the second NMOS tube MN2, the second NMOS tube MN2 is used as a switching tube, the first NMOS tube MN1 and the first PMOS tube MP1 form a totem pole circuit, the driving voltage capacity is improved, the inverter U1 and the totem pole circuit use the same power supply voltage VCC, and the power supply voltage VCC does not exceed 20V.

In this embodiment, the PWM signal output by the microcontroller is shaped into a stable square wave signal by the inverter U1 in an inverted manner, and provides sufficient driving voltage/driving current to drive a totem pole circuit formed by the first NMOS transistor MN1 and the first PMOS transistor MP1, specifically, the logic of the working principle of the totem pole is a high level input, and the upper tube is turned on and the lower tube is turned off to output a high level; and the low level is input, the lower pipe is connected with the upper pipe and is cut off, and the low level is output. Of course, the totem pole circuit is replaced by a triode well known to those skilled in the art; in addition, from the triode combination, the upper tube can also be a triode with a PNP model, and the collector electrode of the triode of the type can be connected with a transformer to realize the power supply output end of the auxiliary winding.

On the basis of the above embodiment, as shown in fig. 1, the driving signal adjusting circuit includes a monostable flip-flop chip, a second capacitor C2, and a fifth resistor R5; the upper edge trigger input end B of the monostable trigger chip is connected with the source electrode of the second NMOS tube MN 2; the lower edge trigger input end A of the monostable trigger chip and the grounding end GND of the monostable trigger chip are grounded; the zero clearing end CLR of the monostable trigger chip and the power supply end VDD of the monostable trigger chip are connected with the power supply component, namely, the power supply voltage VCC is accessed; one end of a fifth resistor R5 is connected with the power supply component, the other end of the fifth resistor R5 is connected with one end of a second capacitor C2, the other end of the second capacitor C2 is grounded, the fifth resistor R5 is connected between a power supply end VDD of the monostable trigger chip and a resistance external end REXT of the monostable trigger chip, and the second capacitor C2 is connected between the resistance external end REXT of the monostable trigger chip and the capacitance external end CEXT of the monostable trigger chip; the trigger input end of the drive signal regulating circuit is an upper edge trigger input end B of a monostable trigger chip, and the output end Q of the monostable trigger chip is a regulating output end of the drive signal regulating circuit; the time constant of the fifth resistor R5 and the second capacitor C2 determines a timing period required by the output terminal Q of the monostable flip-flop chip to generate a level signal with a preset pulse width, including a duration required by the high level signal or the low level signal, which may correspond to an on time or an off time of the transistor or the MOS transistor. The frequency of the signal input by the trigger input end of the driving signal adjusting circuit is the same as the frequency of the signal output by the adjusting output end of the driving signal adjusting circuit, but the voltage input by the trigger input end of the driving signal adjusting circuit is not necessarily the same as the voltage output by the adjusting output end of the driving signal adjusting circuit, and time delay exists between the input signal and the output signal of the driving signal adjusting circuit.

It should be noted that, when a suitable external trigger signal or pulse is applied to the upper edge trigger input terminal B of the monostable flip-flop chip, the output terminal Q of the monostable flip-flop chip is used to generate a single output pulse with a specified width, that is, to output a high level signal or a low level signal with a certain time width. After the external trigger signal or pulse is applied to the monostable trigger chip, a timing period is started, which can be understood as that a complete timing period is passed in response to a single pulse signal output by the driving signal generating circuit, the output end output signal of the monostable trigger chip changes the state of the monostable trigger chip at the beginning of the timing period, the on-off state of the switching circuit can be correspondingly changed, the monostable trigger chip can be kept in a new state on the basis, at least a relatively fixed pulse width can be set, so that the frequency applied by the boost oscillating circuit can be kept to be dynamically controlled in the timing period, and the resonant frequency can be provided for the oscillation working loop of the atomizing sheet in a constant time. The timing period is determined by the product of the fifth resistor R5 and the second capacitor C2, and is used for configuring the pulse width output by the driving signal regulating circuit, including the pulse width of the high-level signal or the low-level signal, and the pulse width corresponds to the on time or the off time of the transistor or the MOS tube; in addition, the length of the timing period is not related to the action time of the signal input by the driving signal adjusting circuit, so that the influence of the external input signal or the interference factor carried by the boost oscillating circuit on the pulse width and the frequency of the PWM signal is reduced.

In some embodiments, the monostable flip-flop chip may comprise a 74LVC1G123 integrated chip. The monostable flip-flop chip may also be implemented with a 555 timer. The monostable flip-flop chip can produce very short pulses or longer rectangular waveforms whose leading edge rises with time with externally applied trigger pulses and whose trailing edge depends on the RC time constant of the feedback component used, which can be time dependent to produce a series of controlled fixed time delays relative to the original trigger pulse; alternatively, the monostable flip-flop chip may produce a very short pulse or a longer rectangular waveform with its leading edge rising over time with an externally applied trigger pulse and its trailing edge depending on the RC time constant of the feedback component used, which may be time dependent to produce a series of controlled fixed time delays relative to the original trigger pulse.

On the basis of the above embodiment, as shown in fig. 1, the driving signal adjusting circuit further includes a sixth resistor R6 and a switch S1; one end of the sixth resistor R6 is connected with the gate of the second NMOS tube MN2, and the other end of the sixth resistor R6 is connected with the power supply component, namely the other end of the sixth resistor R6 is connected with a power supply voltage VCC; one end of the switch S1 is connected with the grid electrode of the second NMOS tube MN2, one end of the switch S1 is simultaneously connected with the grid electrode of the second NMOS tube MN2 and the duty ratio enabling end of the microcontroller, and the other end of the switch S1 is grounded, wherein the switch S1 is equivalent to a switch connected between the driving signal generating circuit and the monostable trigger chip in series and is used for controlling the on-off of an oscillating working loop consisting of the power supply component, the driving signal generating circuit, the driving signal regulating circuit, the switching circuit, the atomizing sheet and the boosting oscillating circuit.

The atomizing sheet oscillation control circuit and the atomizing sheet are arranged in the electronic cigarette, the switch S1 is triggered to be closed or opened according to smoking operation of a user, the switch S1 can be in a specific form of a mechanical key switch or an air pressure sensor, namely, the switch S1 supports manual pressing or automatic induction of air flow change so as to detect whether suction action occurs. When a smoker starts smoking, the switch S1 is turned off, the voltage at the duty cycle enabling end of the microcontroller is divided by the sixth resistor R6 as the power supply voltage VCC, the voltage at the duty cycle enabling end of the microcontroller is high level, the microcontroller is triggered to provide the PWM signal for the driving signal generating circuit, so that driving voltage and frequency required by oscillation are provided for the atomizing sheet, and the surface elastic wave is generated after the atomizing sheet oscillates at a certain frequency so as to atomize the liquid on the surface of the atomizing sheet. When a smoker stops smoking, the switch S1 is closed, the branch where the sixth resistor R6 is located is short-circuited, the voltage at the enabling end of the duty ratio of the microcontroller is 0, and the microcontroller is triggered to stop providing the PWM signal for the driving signal generating circuit, so that the oscillation working loop is cut off, the atomizing sheet stops working, and the atomization process of tobacco tar is finished.

On the basis of the above embodiment, as shown in fig. 1, the switch circuit includes a seventh resistor R7 and a third NMOS transistor MN3, where, in order to improve the driving efficiency, the gate of the third NMOS transistor MN3 is connected to one end of the seventh resistor R7, the source of the third NMOS transistor MN3 is connected to the other end of the seventh resistor R7, the other end of the seventh resistor R7 is grounded, the drain of the third NMOS transistor MN3 is an output end of the switch circuit connected to the atomizing sheet, and the control end of the switch circuit is a gate of the third NMOS transistor MN3 connected to the driving signal adjusting circuit, and in order to improve the driving efficiency, the third NMOS transistor MN3 uses a high-frequency MOS transistor to make the third NMOS transistor MN3 fast on-off. When the driving signal adjusting circuit provides a high-level signal for the third NMOS tube MN3, the third NMOS tube MN3 is conducted, the atomization sheet oscillation control circuit and the atomization sheet are connected into a closed path, at the moment, the oscillation working loop is connected into a conducted loop, driving electric energy is transmitted to the atomization sheet, the atomization sheet is enabled to vibrate rapidly, and tobacco tar is atomized. When the driving signal adjusting circuit provides a low-level signal for the third NMOS tube MN3, the third NMOS tube MN3 is turned off, the seventh resistor R7 is used as a pull-down resistor, the grid level of the third NMOS tube MN3 is pulled down and is conducted to the ground to keep a cut-off state, for example, when a PWM signal is not added to the driving signal generating circuit, the switching circuit is kept off, the atomizing sheet is turned into an open state, the atomizing sheet oscillation control circuit and the atomizing sheet cannot form a closed path, driving electric energy is not transmitted to the atomizing sheet, atomization is stopped, and the reserved time dissipates heat for the MOS tube in the atomizing sheet oscillation control circuit. Because the frequency of the signal input by the trigger input end of the driving signal adjusting circuit is the same as the frequency of the signal output by the adjusting output end of the driving signal adjusting circuit, the driving signal adjusting circuit provides a duty ratio signal for the third NMOS tube MN3, and the driving signal adjusting circuit periodically controls the on and off of the switching circuit, so that the temperature rise of a discrete element or a chip module is limited by controlling the on time of the switching circuit at regular time, and the influence of the temperature on the operation of an atomization sheet is restrained.

As an embodiment, as shown in fig. 1, the boost oscillating circuit includes a linear boost unit, an inductor L, a third capacitor C3, a fourth capacitor C4, and an eighth resistor R8; the input end of the linear boosting unit is connected with the power supply component so as to boost the VCC voltage provided by the power supply component to the driving voltage required by the oscillation (for example, reaching a resonance state) of the atomizing sheet; the output end of the linear boosting unit is connected with one end of an inductor L, the other end of the inductor L is connected with one end of a third capacitor C3, the other end of the third capacitor C3 is connected with one end of a fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded; one end of the eighth resistor R8 is connected between the inductor L and the third capacitor C3 to form an inductor-capacitor network, so that a hardware condition for starting vibration is formed; the other end of the eighth resistor R8 is connected with the output end of the switching circuit, and the eighth resistor R8 can serve as a driving resistor to provide enough driving current for the atomizing sheet. The output end of the boost oscillation circuit is arranged at a common endpoint of the third capacitor C3 and the fourth capacitor C4, preferably, the positive electrode of the atomizing sheet is connected with the common endpoint, and the negative electrode of the atomizing sheet is connected with the output end of the switch circuit; the linear boosting unit is a direct current boosting chip or a resistance-capacitance boosting circuit connected with the direct current boosting chip; specifically, the direct current booster chip is the linear booster unit, or the linear booster unit is composed of a direct current booster chip and peripheral circuits thereof, and the direct current booster chip is preferably an LM2596 series DC-DC direct current booster chip. The power supply assembly boosts the voltage to obtain the working voltage required by the atomizing sheet through the linear boosting unit, during the high level of the PWM signal or during the period of generating the high level at the output end of the driving signal adjusting circuit, the signal boosted and output by the linear boosting unit sequentially passes through the RC filter network (which can be regarded as that the third capacitor C3 and the eighth resistor R8 are connected in parallel), the LC network (which can be regarded as that the third capacitor C3 and the inductor L are connected in series), and under the driving action of the driving signal generating circuit and the switching circuit, the driving signal adjusting circuit can accelerate to reach the resonance state within the stable pulse width range generated by adjusting, preferably, the oscillation frequency generated by the boosting oscillation circuit can be in proportional relation with the duty ratio of the PWM signal.

In summary, the foregoing embodiments are based on improving the driving capability of the atomizing operation of the atomizing sheet, including improving the driving voltage and enabling the atomizing sheet to be in an oscillating state for a controllable time, and controlling the oscillating operation of the atomizing sheet by using at most one resistive-capacitive network and at most one chip module in each circuit, so that heat is not easy to collect, and miniaturization of the electronic atomizing terminal with the atomizing sheet oscillation control circuit therein is easy to be realized. In addition, in the atomizing sheet oscillation control circuit disclosed by the application, the driving signal generating circuit is used for shaping the PWM signal provided by the microcontroller into a stable square wave signal, and providing a large enough driving voltage current for the boosting oscillation circuit and the driving signal adjusting circuit, triggering the driving signal adjusting circuit to quicken responding to a high-level signal or a low-level signal output by the driving signal generating circuit, triggering the driving signal adjusting circuit to generate positive and negative pulse signals with a certain time width, namely generating a single output pulse with a specified width, namely 'high' or 'low', so that not only is the MOS tube in the switching circuit conducted to the ground to discharge rapidly, but also the driving signal adjusting circuit is used for controlling the switching circuit to be turned on and off periodically, and the influence of temperature on the operation of the atomizing sheet is restrained.

Based on the foregoing embodiment, an electronic atomization terminal is also disclosed, including the atomization plate oscillation control circuit disclosed in the foregoing embodiment. Fewer discrete components are adopted to accelerate the driving of the LC network to oscillate under higher voltage, the influence of overhigh temperature of the MOS tube is overcome, and the miniaturization of the electronic atomizing terminal with the atomizing sheet oscillation control circuit inside is easy to realize. Compared with the prior art, the voltage frequency feedback is carried out on a single microcontroller by using a plurality of RC networks and LC networks, the voltage frequency feedback device adopts fewer discrete elements and smaller-scale chip modules, and the transient state of the monostable trigger is fully utilized to stabilize the pulse width adjustment of the high level and the low level of the duty ratio so as to accelerate the oscillation starting of the atomizing sheet in the closed channel, and the atomizing efficiency and the cooling effect of the atomizing sheet are improved.

Preferably, the electronic atomizing terminal may be used as an electronic cigarette.

The specific working process of the electronic atomizing terminal is as follows:

when a smoking action (smoking action) exists, the switch S1 is turned off, the microcontroller is triggered to provide the PWM signal for the driving signal generating circuit, the driving signal generating circuit shapes the PWM signal into a stable square wave signal and improves the electric quantity driving capability of an MOS tube arranged in the driving signal generating circuit, and then a high-level signal or a low-level signal is output to the driving signal adjusting circuit. When the driving signal generating circuit inputs high level, the driving signal adjusting circuit adjusts the input high level into a high level signal with a specified width and delays and outputs the high level signal to the switch circuit to control the conduction of an NMOS tube in the switch circuit, and at the moment, the power supply component, the driving signal generating circuit, the driving signal adjusting circuit, the switch circuit, the atomizing sheet and the boosting oscillation circuit form a conducted oscillation working loop, namely a conducted loop; and triggering the atomizing sheet to start oscillation, and generating surface elastic waves after the atomizing sheet oscillates at a certain frequency so as to atomize the liquid on the surface of the atomizing sheet. When the driving signal generating circuit inputs low level, the driving signal adjusting circuit adjusts the input low level into a low level signal with a specified width and delays and outputs the low level signal to the switching circuit to control the NMOS tube in the switching circuit to be turned off, and at the moment, the power supply component, the driving signal generating circuit, the driving signal adjusting circuit, the switching circuit, the atomizing sheet and the boosting oscillation circuit form an open oscillation working loop; and triggering the atomizing sheet to stop oscillating, wherein the liquid on the surface of the atomizing sheet does not continue atomizing.

When there is no smoking action (stopping smoking action), the switch S1 is closed, triggering the microcontroller to stop providing the PWM signal to the driving signal generating circuit, the branch where the sixth resistor R6 is located is shorted, the voltage at the duty cycle enabling end of the microcontroller is 0, triggering the microcontroller to stop providing the PWM signal to the driving signal generating circuit, thus cutting off the oscillating working circuit, the atomizing sheet does not drive the electric pressing driving frequency, the atomizing sheet stops working, and the atomizing process is ended.

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

Claims

1. The atomizing sheet oscillation control circuit is characterized by comprising a microcontroller, a driving signal generating circuit, a boosting oscillation circuit, a driving signal adjusting circuit, a switching circuit and a power supply component;

The power supply component is connected with one end of the atomizing sheet sequentially through the driving signal generating circuit, the driving signal adjusting circuit and the switching circuit, and is also connected with the other end of the atomizing sheet through the boosting oscillating circuit, and the duty ratio output end of the microcontroller is connected with the signal input end of the driving signal generating circuit.

2. The atomizing plate oscillation control circuit according to claim 1, wherein the signal output end of the driving signal generating circuit is connected with the trigger input end of the driving signal adjusting circuit, and the adjusting output end of the driving signal adjusting circuit is connected with the control end of the switching circuit;

one end of the atomizing sheet is connected with the output end of the switch circuit, and the other end of the atomizing sheet is connected with the output end of the boosting oscillation circuit.

3. The aerosol chip oscillation control circuit of claim 2, wherein the drive signal generation circuit comprises a first resistor, a second resistor, an inverter, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first PMOS transistor, a first NMOS transistor, and a second NMOS transistor;

the first input end of the inverter is a signal input end of the driving signal generating circuit, and is connected with the PWM signal output by the microcontroller;

The first resistor is connected between the first input end of the inverter and the second input end of the inverter, and the first input end of the inverter is connected with the positive power end of the inverter through the second resistor; the positive power end of the inverter is connected with one end of a third resistor, the other end of the third resistor is connected between the first capacitor and the fourth resistor, and the other end of the third resistor is also connected with the power supply component;

the power supply component is grounded through a first capacitor, and the drain electrode of the first NMOS tube is connected with the power supply component through a fourth resistor;

the source electrode of the first PMOS tube is connected with the source electrode of the first NMOS tube, the grid electrode of the first PMOS tube is connected with the grid electrode of the first NMOS tube, the grid electrode of the first NMOS tube is connected with the output end of the phase inverter, the drain electrode of the first PMOS tube is grounded, the drain electrode of the second NMOS tube is connected between the source electrode of the first PMOS tube and the source electrode of the first NMOS tube, the driving signal generating circuit is connected to the driving signal regulating circuit through the second NMOS tube, and the signal output end of the driving signal generating circuit is the source electrode of the second NMOS tube.

4. The aerosol patch oscillation control circuit of claim 3, wherein the drive signal conditioning circuit comprises a monostable flip-flop chip, a second capacitor, and a fifth resistor;

The upper edge trigger input end of the monostable trigger chip is connected with the source electrode of the second NMOS tube, and the lower edge trigger input end of the monostable trigger chip and the grounding end of the monostable trigger chip are grounded;

the zero clearing end of the monostable trigger chip and the power supply end of the monostable trigger chip are connected with the power supply assembly;

one end of a fifth resistor is connected with the power supply component, the other end of the fifth resistor is connected with one end of a second capacitor, the other end of the second capacitor is grounded, the fifth resistor is connected between the power supply end of the monostable trigger chip and the resistor external end of the monostable trigger chip, and the second capacitor is connected between the resistor external end of the monostable trigger chip and the capacitor external end of the monostable trigger chip;

the trigger input end of the drive signal regulating circuit is the upper edge trigger input end of a monostable trigger chip, and the output end of the monostable trigger chip is the regulating output end of the drive signal regulating circuit;

the time constant of the fifth resistor and the second capacitor determines a timing period required by the output end of the monostable trigger chip to generate a level signal with preset pulse width; the frequency of the signal input by the trigger input end of the driving signal adjusting circuit is the same as the frequency of the signal output by the adjusting output end of the driving signal adjusting circuit.

5. The atomizing plate oscillation control circuit of claim 4, wherein said drive signal conditioning circuit further comprises a sixth resistor and a switch;

one end of the sixth resistor is connected with the grid electrode of the second NMOS tube, and the other end of the sixth resistor is connected with the power supply component;

one end of the switch is connected with the grid electrode of the second NMOS tube and the duty ratio enabling end of the microcontroller at the same time, and the other end of the switch is grounded.

6. The atomizing plate oscillation control circuit of claim 5, wherein the switching circuit comprises a seventh resistor and a third NMOS transistor, a gate of the third NMOS transistor is connected to one end of the seventh resistor, a source of the third NMOS transistor is connected to the other end of the seventh resistor, the other end of the seventh resistor is grounded, a drain of the third NMOS transistor is an output terminal of the switching circuit to be connected to the atomizing plate, and a control terminal of the switching circuit is a gate of the third NMOS transistor to be connected to the driving signal adjusting circuit.

7. The atomizing plate oscillation control circuit according to claim 2, wherein the boost oscillation circuit includes a linear boost unit, an inductor, a third capacitor, a fourth capacitor, and an eighth resistor;

the input end of the linear boosting unit is connected with the power supply component, the output end of the linear boosting unit is connected with one end of the inductor, the other end of the inductor is connected with one end of the third capacitor, the other end of the third capacitor is connected with one end of the fourth capacitor, and the other end of the fourth capacitor is grounded; one end of the eighth resistor is connected between the inductor and the third capacitor, and the other end of the eighth resistor is connected with the output end of the switching circuit; the output end of the boost oscillating circuit is arranged at a common endpoint of the third capacitor and the fourth capacitor;

The linear boosting unit is a direct current boosting chip or a resistance-capacitance boosting circuit connected with the direct current boosting chip.

8. The atomizing plate oscillation control circuit of claim 2, wherein the microcontroller is enabled to modulate an ac signal or a dc signal to a PWM signal and output by the duty cycle output;

the power supply component is used for providing direct current signals or alternating current signals for the driving signal generating circuit, the boosting oscillating circuit and the driving signal regulating circuit respectively.

9. The atomizing plate oscillation control circuit of claim 8, wherein the atomizing plate comprises, but is not limited to, a piezoceramic plate;

the atomization sheet generates surface elastic waves after oscillating at a certain frequency so as to atomize liquid on the surface of the atomization sheet; the certain frequency is generated after the voltage is applied to the atomizing sheet by the boosting oscillating circuit and the switching circuit.

10. An electronic atomizing terminal comprising the atomizing plate oscillation control circuit according to any one of claims 1 to 9.